History

There are nineteen skulls of various sizes. Some of the skulls have been identified but the identity of most of the dragon skulls are unknown. It is possible that some of the dragon skulls may have been brought to Westeros by the Targaryens when they fled Valyria prior to the Doom. George R. R. Martin has said that there were once dragons all over,[4] so it is possible some skulls could have originated from Westeros.

Recent Events

A Game of Thrones

On the way to the WallTyrion Lannister remembers seeking out the dragon skulls in King's Landing the first time he was there. He recalls having a torch with him when he discovered the skulls and having the sensation that they seemed to like it when he put his torch to them. There were three skulls much larger than the others, the ones that belonged to Vhagar, Meraxes and Balerion.[5]

Arya Stark ends up lost in a dark cellar in the Red Keep, and in the gloom she finds the dragon skulls all around her. Initially she is afraid, but she soon overcomes her fear and makes her way over to touch one of the monsters. She can tell it is bone and that it is dead, but has a feeling that it knows she is there and that it does not love her.[3]

Finally a great pair of bronze doors appeared to her left, grander than the rest. They swung open as she neared, and she had to stop and look. Beyond loomed a cavernous stone hall, the largest she had ever seen. The skulls of dead dragons looked down from its walls.[7]